Calumny

Falsely accusing one, or making false statements such as to ruin the reputation of the person in question.

Slander, Character assassination, Defamation

It is a hobby of the media to spread calumny about celebrities.

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calumnious

(of a statement) false and defamatory; slanderous.

Once Trump stepped down from a political platform, his calumnious speeches provoked baying applause from audiences, he was courteous and considerate even to foreign politicians he had just slandered in the speech